Abstract

The influence of charge-carrier concentration on the magnetic properties of the semimagnetic semiconductor [(PbTe)1-x(SnTe)x]1-y[MnTe] y (x=0.72, y=0.03) is reported. Magnetization, magnetic susceptibility, and specific heat have been measured. For carrier concentrations below p=3 x 1020 cm-3 the alloy is paramagnetic. For p≥3 x 1020 cm-3 an abrupt transition to a ferromagnetic phase is observed at helium temperatures. The ferromagnetic transition temperature increases with increasing p. This is the first demonstration of the effect of carrier concentration on the magnetic properties of semimagnetic semiconductors.

Disciplines

Physics

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This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Physical Society. The following article appeared in Physical Review Letters.

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URL: http://digitalcommons.calpoly.edu/phy_fac/146